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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > galaxy group

galaxy group comparison table

Subject	has number of galaxie	has definition
compact group	< 10	Galaxy group with a few galaxies separated by a few galaxy diameters.
loose group	10 to 100	Galaxy group with on the order of 10 galaxies separated by 10-100 galaxy diameters.

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